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tracing: make CALLER_ADDRx overwriteable

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The current definition of CALLER_ADDRx isn't suitable for all platforms.
E.g. for ARM __builtin_return_address(N) doesn't work for N > 0 and
AFAIK for powerpc there are no frame pointers needed to have a working
__builtin_return_address.  This patch allows defining the CALLER_ADDRx
macros in <asm/ftrace.h> and let these take precedence.

Because now <asm/ftrace.h> is included unconditionally in
<linux/ftrace.h> all archs that don't already had this include get an
empty one for free.

Signed-off-by: Uwe Kleine-Koenig <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Ingo Molnar <[email protected]>
Reviewed-by: KOSAKI Motohiro <[email protected]>
Signed-off-by: Steven Rostedt <[email protected]>
This commit is contained in:
Uwe Kleine-Koenig 2009-02-27 21:30:03 +01:00 • committed by Steven Rostedt
commit c79a61f557
14 changed files with 34 additions and 20 deletions
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1
include/asm-m32r/ftrace.h Normal file
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@ -0,0 +1 @@
/* empty */